Irssi

http://www.spock.mga.com.pl/public/download/eng/nickserv.pl

http://irssi.org/?page=docs&doc=startup-HOWTO#c3

/set hostname -  change host irc'ing from
^n (next) and ^p (previous) to change windows
/set autolog on
/set nick
/set real_name
/DISCONNECT network   - disconnect server with tag "network"
/DISCONNECT recon-1  - stop trying to reconnect to RECON-1 server
/RMRECONNS           - stop all server reconnections
/LASTLOG word     - print all lines with "word" in them
/LASTLOG word 10  - print last 10 occurances of "word"
/LASTLOG -topics  - print all topic changes

Search for foodle in scrollback buffer and display 5 lines of context before and after the match:

/lastlog -5 foodle

See also:

/help lastlog